CN110905616A - Backpressure adjusting system and method for steam extraction backpressure type water supply pump steam turbine - Google Patents
Backpressure adjusting system and method for steam extraction backpressure type water supply pump steam turbine Download PDFInfo
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- CN110905616A CN110905616A CN201911076782.6A CN201911076782A CN110905616A CN 110905616 A CN110905616 A CN 110905616A CN 201911076782 A CN201911076782 A CN 201911076782A CN 110905616 A CN110905616 A CN 110905616A
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- 238000000605 extraction Methods 0.000 title claims abstract description 87
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 9
- 230000001105 regulatory effect Effects 0.000 claims abstract description 85
- 230000001172 regenerating effect Effects 0.000 claims abstract description 36
- 239000013589 supplement Substances 0.000 claims abstract description 8
- 239000000284 extract Substances 0.000 claims abstract description 3
- 230000009469 supplementation Effects 0.000 claims description 14
- 230000001502 supplementing effect Effects 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
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- 238000004134 energy conservation Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/345—Control or safety-means particular thereto
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/38—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
The invention relates to a backpressure regulating system and method for a steam-extraction backpressure type water-feeding pump steam turbine, wherein the system comprises a small water-feeding pump steam turbine, a driving steam pipeline, a backheating steam-extraction pipeline regulating valve, a converging header, a steam-extraction steam-supplement pipeline regulating valve, a discharge pipeline regulating valve and a backpressure controller; the driving steam pipeline is connected with the small steam turbine; the middle extraction steam of the small steam turbine enters the regenerative heater through a regenerative extraction steam pipeline; exhausting gas of the small steam turbine to enter a converging header; the exhaust of the small steam turbine enters the regenerative heater through a regenerative steam extraction pipeline regulating valve; the extracted steam from the main turbine enters a converging manifold through a regulating valve; the converging collector is connected with a condenser through a regulating valve; the steam extracted from the main turbine is connected with a regenerative steam extraction pipeline regulating valve through a regulating valve and enters a regenerative heater. The invention can ensure the stable control of the back pressure of the start-stop and normal operation of the small turbine, and effectively extract steam to return to the water heater while ensuring the normal driving of the water pump by the small turbine.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and particularly relates to a steam extraction back pressure type water feeding pump steam turbine back pressure adjusting system and method.
Background
With the development of million-first-reheat, two-reheat high-parameter and large-capacity generator sets, the high-parameter ultra-supercritical generator set with 35 MPa-level steam inlet parameters is becoming a research object, the cycle thermal efficiency of the generator set can be further improved, and energy conservation and emission reduction are greatly promoted.
In order to reduce the superheat degree of steam extraction heat return under the high parameter condition, a steam extraction back pressure type water feeding pump steam turbine set system is provided. Namely, a water feeding pump is driven by a small steam turbine with a steam extraction back pressure type, namely, a heater of a middle steam extraction joint belt part of the small steam turbine is arranged at the same time. The small turbine and the main turbine of the water supply pump are simultaneously connected with the regenerative heater, so the system is also called a double-machine regenerative system.
Effective operation, especially the drive power of the small steam turbine of the system needs to carry out accurate control on back pressure, so that economic operation is ensured on one hand, and safe operation of a unit is ensured on the other hand.
Because the steam admission regulation and the self power balance of the shafting of the small steam turbine completely depend on the steam extraction back pressure, the problems of safe operation control and economic control under variable load working conditions are not enough to be completely solved.
Disclosure of Invention
The invention aims to provide a system and a method for regulating the back pressure of a steam turbine of a steam extraction back pressure type water feeding pump, which can realize the purpose of safe and economic control of the back pressure of a small steam turbine while synchronously driving a water feeding pump and a belt heater by the small steam turbine.
The invention provides a steam extraction back pressure type water feeding pump steam turbine back pressure adjusting system which comprises a small water feeding pump steam turbine, a driving steam pipeline, a backheating steam extraction pipeline adjusting valve, a converging header, a steam extraction and steam supplementation pipeline adjusting valve, a discharge pipeline adjusting valve and a back pressure controller, wherein the back pressure controller is connected with the driving steam pipeline;
the driving steam pipeline is connected with the small water feeding pump turbine and is used for sending extracted steam from a main turbine to the air inlet end of the small water feeding pump turbine;
the middle extraction steam of the small turbine of the water supply pump enters the corresponding regenerative heater through the regenerative extraction steam pipeline; the exhaust of the small turbine of the feed pump enters the converging header; the exhaust of the small turbine of the water feeding pump enters the corresponding regenerative heater through the regenerative steam extraction pipeline regulating valve; the extracted steam from the main turbine enters the converging header through an extracted steam and steam supplementing pipeline regulating valve;
the collecting pipe is connected to the condenser through a discharge pipeline regulating valve; the extracted steam from the main steam turbine is connected with the regenerative extraction steam pipeline regulating valve through an extraction steam supplementing pipeline regulating valve and enters the corresponding regenerative heater;
the heat-return steam extraction pipeline regulating valve, the steam extraction and steam supplementation pipeline regulating valve and the discharge pipeline regulating valve are connected with the back pressure controller.
The invention also provides a method for regulating the back pressure of the steam extraction back pressure type water supply pump steam turbine by applying the back pressure regulating system of the steam extraction back pressure type water supply pump steam turbine, which is characterized by comprising the following steps:
when the small turbine of the water feeding pump coaxially drives the water feeding pump, the heater is connected with the adjusting valve of the regenerative steam extraction pipeline and the regenerative steam extraction pipeline, and simultaneously, under the coordination control of the back pressure controller, the main turbine extracts steam to supplement steam to the heater and adjust the back pressure of the small turbine of the water feeding pump through the steam extraction and steam supplementation adjusting valve, and when the back pressure is abnormally increased, the emergency pressure relief is carried out through the adjusting valve of the discharge pipeline;
when the system normally operates, the discharge pipeline regulating valve is kept closed, the back-heating steam extraction pipeline regulating valve is kept at a certain opening degree, and the steam extraction and steam supplementation regulating valve is kept at a certain opening degree; when the back pressure of the small steam turbine of the water supply pump rises, the back pressure controller synchronously gives an instruction to open the large regenerative steam extraction pipeline regulating valve and close the small steam extraction steam supplement regulating valve for control;
when the backpressure is abnormally increased to a set value, the backpressure controller sends a command to open the discharge pipeline regulating valve to discharge the exhaust steam to the condenser in an emergency manner;
when the back pressure is reduced, the back pressure controller sends an instruction to open a large steam extraction and steam supplementation regulating valve and close a small heat return steam extraction pipeline regulating valve.
By means of the scheme, the backpressure stability control of the start and stop and normal operation of the small steam turbine can be ensured through the backpressure regulating system and method of the steam extraction backpressure water-feeding pump steam turbine, and the effective steam extraction heat-returning water-feeding heater is carried out while the small steam turbine is ensured to normally drive the water-feeding pump. Meanwhile, the effective control of the back pressure ensures that the small steam turbine has no throttling loss in steam admission regulation, and the throttling loss can be reduced by more than 20%. Meanwhile, due to the coordinated and accurate control of the backpressure controller, the abnormal operation time of the backpressure of the small turbine can be reduced, and the unit is ensured to operate under the economic backpressure all the time.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of a back pressure regulating system of a steam turbine of a steam extraction back pressure type feed water pump.
Reference numbers in the figures:
1-a small steam turbine of a water supply pump; 2-driving the steam pipeline; 3-a heat-regenerative steam extraction pipeline; 4-backheating steam extraction pipeline adjusting valve; 5-a converging header; 6-steam extraction and supplement pipeline adjusting valve; 7-discharge line regulating valve; 8-backpressure controller.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 1, the embodiment provides a steam extraction back pressure type feed pump steam turbine back pressure regulating system, which includes a small feed pump steam turbine 1, a driving steam pipeline 2, a backheating steam extraction pipeline 3, a backheating steam extraction pipeline regulating valve 4, a converging header 5, a steam extraction and steam supplementation pipeline regulating valve 6, a discharge pipeline regulating valve 7, and a back pressure controller 8; the driving steam pipeline 2 is connected with the small water feeding pump turbine 1 and is used for sending extracted steam from a certain section of the main turbine to the air inlet end of the small water feeding pump turbine 1; the middle extraction steam of the small steam turbine 1 of the water feeding pump enters the corresponding regenerative heater through the regenerative extraction steam pipeline 3; the exhaust of the small turbine 1 of the feed pump enters a converging header 5; the exhaust of the small turbine 1 of the water feeding pump enters the corresponding regenerative heater through the regenerative steam extraction pipeline regulating valve 4; the extracted steam from the main turbine enters a converging manifold 5 through an extracted steam and steam supplementing pipeline regulating valve 6; the confluent pipe 5 is connected to a condenser through a discharge pipeline regulating valve 7; the extraction steam from the main turbine is connected with the regenerative extraction steam pipeline regulating valve 4 through the extraction steam supplementing pipeline regulating valve 6 and enters the corresponding regenerative heater; the heat return steam extraction pipeline regulating valve 4, the steam extraction and steam supplementation pipeline regulating valve 6 and the discharge pipeline regulating valve 7 are connected with a back pressure controller 8.
The method for regulating the back pressure by using the steam extraction back pressure type feed pump steam turbine back pressure regulating system comprises the following steps:
when the small turbine 1 of the water feeding pump coaxially drives the water feeding pump, a heater is connected with the regenerative steam extraction pipeline 3 and the regenerative steam extraction pipeline regulating valve 4, and simultaneously, under the coordination control of a back pressure controller 8, steam is extracted from the main turbine, steam is supplemented to the heater through the steam extraction and steam supplementation regulating valve 6, the back pressure of the small turbine of the water feeding pump is regulated, and when the back pressure is abnormally increased, emergency pressure relief is carried out through the discharge pipeline regulating valve 7;
when the device normally operates, the discharge pipeline regulating valve 7 is kept closed, the back-heating steam extraction pipeline regulating valve 4 is kept at a certain opening degree, and the steam extraction and steam supplementation regulating valve 6 is kept at a certain opening degree; when the back pressure of the small steam turbine 1 of the water supply pump rises, the back pressure controller 8 synchronously gives an instruction to open the large regenerative steam extraction pipeline regulating valve 4 and close the small steam extraction steam supplement regulating valve 6 for control;
when the back pressure is abnormally increased to a certain value (set value), the back pressure controller 8 gives an instruction to open the discharge pipeline regulating valve 7 to discharge the exhaust to the condenser in an emergency, and at the moment, the opening degree of the regulating valve 4 is kept at 100%. When the back pressure returns to the normal range, the regulating valve 7 is gradually closed down until it is completely closed.
When the back pressure is reduced, the back pressure controller 8 gives an instruction to open the large steam extraction and steam supplementation regulating valve 6 and close the small regenerative steam extraction pipeline regulating valve 4. When the back pressure is abnormally low, the opening degrees of the regulating valve 4 and the regulating valve 6 are synchronously regulated, and simultaneously, the steam inlet quantity of the small steam turbine can be regulated. Due to the coordinated and accurate control of the backpressure controller 8, the abnormal operation time of the backpressure of the small turbine can be reduced, and the unit is ensured to operate under the economic backpressure all the time.
This backpressure governing system can ensure that little steam turbine opens and stops and the backpressure stable control of normal operating, carries out effective extraction backheat feedwater heater when guaranteeing little steam turbine normal drive feedwater pump. Meanwhile, the effective control of the back pressure ensures that the small steam turbine has no throttling loss in steam admission regulation, and the throttling loss can be reduced by more than 20%. Meanwhile, due to the coordinated and accurate control of the backpressure controller 8, the abnormal operation time of the backpressure of the small turbine can be reduced, and the unit is ensured to operate under the economic backpressure all the time.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (2)
1. A back pressure regulating system of a steam-extraction back-pressure type water-feeding pump steam turbine is characterized by comprising a small water-feeding pump steam turbine, a driving steam pipeline, a backheating steam-extraction pipeline regulating valve, a converging header, a steam-extraction steam-supplement pipeline regulating valve, a discharge pipeline regulating valve and a back pressure controller;
the driving steam pipeline is connected with the small water feeding pump turbine and is used for sending extracted steam from a main turbine to the air inlet end of the small water feeding pump turbine;
the middle extraction steam of the small turbine of the water supply pump enters the corresponding regenerative heater through the regenerative extraction steam pipeline; the exhaust of the small turbine of the feed pump enters the converging header; the exhaust of the small turbine of the water feeding pump enters the corresponding regenerative heater through the regenerative steam extraction pipeline regulating valve; the extracted steam from the main turbine enters the converging header through an extracted steam and steam supplementing pipeline regulating valve;
the collecting pipe is connected to the condenser through a discharge pipeline regulating valve; the extracted steam from the main steam turbine is connected with the regenerative extraction steam pipeline regulating valve through an extraction steam supplementing pipeline regulating valve and enters the corresponding regenerative heater;
the heat-return steam extraction pipeline regulating valve, the steam extraction and steam supplementation pipeline regulating valve and the discharge pipeline regulating valve are connected with the back pressure controller.
2. A method for regulating back pressure of a steam extraction back pressure feed pump turbine by using the back pressure regulating system of the steam extraction back pressure feed pump turbine according to claim 1, comprising the following steps:
when the small turbine of the water feeding pump coaxially drives the water feeding pump, the heater is connected with the adjusting valve of the regenerative steam extraction pipeline and the regenerative steam extraction pipeline, and simultaneously, under the coordination control of the back pressure controller, the main turbine extracts steam to supplement steam to the heater and adjust the back pressure of the small turbine of the water feeding pump through the steam extraction and steam supplementation adjusting valve, and when the back pressure is abnormally increased, the emergency pressure relief is carried out through the adjusting valve of the discharge pipeline;
when the system normally operates, the discharge pipeline regulating valve is kept closed, the back-heating steam extraction pipeline regulating valve is kept at a certain opening degree, and the steam extraction and steam supplementation regulating valve is kept at a certain opening degree; when the back pressure of the small steam turbine of the water supply pump rises, the back pressure controller synchronously gives an instruction to open the large regenerative steam extraction pipeline regulating valve and close the small steam extraction steam supplement regulating valve for control;
when the backpressure is abnormally increased to a set value, the backpressure controller sends a command to open the discharge pipeline regulating valve to discharge the exhaust steam to the condenser in an emergency manner;
when the back pressure is reduced, the back pressure controller sends an instruction to open a large steam extraction and steam supplementation regulating valve and close a small heat return steam extraction pipeline regulating valve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911076782.6A CN110905616A (en) | 2019-11-06 | 2019-11-06 | Backpressure adjusting system and method for steam extraction backpressure type water supply pump steam turbine |
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| CN201911076782.6A CN110905616A (en) | 2019-11-06 | 2019-11-06 | Backpressure adjusting system and method for steam extraction backpressure type water supply pump steam turbine |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105019957A (en) * | 2015-07-27 | 2015-11-04 | 中国能源建设集团广东省电力设计研究院有限公司 | Efficient heat regenerative system and method |
| CN108843412A (en) * | 2018-06-29 | 2018-11-20 | 东方电气集团东方汽轮机有限公司 | A kind of Steam Turbine Regenerative System |
| CN211598767U (en) * | 2019-11-06 | 2020-09-29 | 大唐郓城发电有限公司 | Steam extraction back pressure type water feeding pump steam turbine back pressure adjusting system |
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- 2019-11-06 CN CN201911076782.6A patent/CN110905616A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105019957A (en) * | 2015-07-27 | 2015-11-04 | 中国能源建设集团广东省电力设计研究院有限公司 | Efficient heat regenerative system and method |
| CN108843412A (en) * | 2018-06-29 | 2018-11-20 | 东方电气集团东方汽轮机有限公司 | A kind of Steam Turbine Regenerative System |
| CN211598767U (en) * | 2019-11-06 | 2020-09-29 | 大唐郓城发电有限公司 | Steam extraction back pressure type water feeding pump steam turbine back pressure adjusting system |
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Application publication date: 20200324 |
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